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"23.15 Comparing Marks: Differences Versus Similarities [1] The Anti-Dissection Rule [a] Compare composites as a Whole Conflicting composite marks are to be compared by looking at them as a whole, rather than breaking the marks up into their component parts for comparison. This is the "anti-dissection" rule. The rationale for the rule is that the commercial impression of a composite trademark on an ordinary prospective buyer is created by the mark as a whole, not by its component parts. However, it is not a violation of the anti-dissection rule to view the component parts of conflicting composite marks as a preliminary step on the way to an ultimate determination of probable customer reaction to the conflicting composites as a whole.

The anti-dissection rule is based upon a common sense observation of customer behavior: the typical shopper does not retain all of the individual details of a composite mark in his or her mind, but retains only an overall, general impression created by the composite as a whole. It is the overall impression created by the mark from the ordinary shopper‟s cursory observation in the marketplace that will or will not lead to a likelihood of confusion, not the impression created from a meticulous comparison as expressed in carefully weighed analysis in legal briefs.

In litigation over the alleged similarity of marks, the owner will emphasize the similarities and the alleged infringer will emphasize the differences. The point is that the two marks should not be examined with a microscope to find the differences, for this is not the way the average purchaser views the marks. To the average buyer, the points of similarity are more important that minor points of difference. A court should not engage in "technical gymnastics" in an attempt to find some minor differences between conflicting marks. However, where there are both similarities and differences in the marks, there must be weighed against one another to see which predominate. The rationale of the anti-dissection rule is based upon this assumption: "An average purchaser does not retain all the details of a mark, but rather the mental impression of the mark creates in its totality. It has been held to be a violation of the anti-dissection rule to focus upon the "prominent" feature of a mark and decide likely confusion solely upon that feature, ignoring all other elements of the mark. Similarly, it is improper to find that one portion of a composite mark has no trademark significance, leading to a direct comparison between only that which remains."